Compare/J.I. Case 420B vs J.I. Case 580B Construction King

J.I. Case 420B vs J.I. Case 580B Construction King

Verdict: J.I. Case 420B vs J.I. Case 580B Construction King

The J.I. Case 420B and the J.I. Case 580B Construction King are both industrial tractors — here is how they stack up on the figures that matter. J.I. Case 580B Construction King leads on rated power with 50 hp against 47 hp. J.I. Case 420B is the lighter machine (2,918 kg vs 4,170 kg), which helps on soft ground and transport, while the heavier model carries more ballast for traction-limited draft work. J.I. Case 580B Construction King is the newer design (1971 vs 1958). In short: choose the J.I. Case 580B Construction King for outright pulling power, or the J.I. Case 420B if a tighter budget and lighter footprint matter more. Compare the full spec tables below before booking a demo.

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Acreage600 acBudgetMain crop / use

Fit & specs

J.I. Case

Fit score

Best match

Clear

J.I. Case

Fit score

Best match

Clear

Rated power

47 hp

50 hp

Confidence

40%

Guide price

—

Overview

Manufacturer

J.I. CaseReference

With 13x24 rear tires. Reverse speeds are 25% faster than forward.Reference

With 14.9x24 rear tires and hand controls. Foot pedals limited to 10MPH.Reference

Variants

320

gearReference

—

420

torque converterReference

—

Engine

Engine (gross)

35.0 kWReference

—

Drawbar (claimed)

24.6 kWReference

—

Displacement

2.4 LReference

2.6 LReference

Bore/Stroke

86 x 105 mmReference

89 x 105 mmReference

Power (gross)

35.0 kWReference

—

Fuel system

carburetorReference

—

Air cleaner

oil bathReference

dry elementReference

Compression

7.1:1Reference

7.42:1Reference

Rated RPM

2100Reference

Idle RPM

500-2125Reference

—

Firing order

1-3-4-2Reference

—

Starter

electricReference

—

Starter volts

12Reference

Coolant capacity

12.3 LReference

13.2 LReference

Sparkplug

Champion D16Reference

—

Sparkplug gap

0.635 mmReference

—

Point gap

0.508 mmReference

—

Intake valve clearance

0.356 mmReference

—

Exhaust valve clearance

0.356 mmReference

—

Oil capacity

12.3 LReference

3.8 LReference

Engine

—

37.3 kWReference

Power

—

32.1 kWReference

Torque

—

165.4 NmReference

Torque RPM

—

1250Reference

Transmission

Gears

8 forward and reverseReference

infinite forward and reverseReference

Oil type

SAE 90 EPReference

—

Capacities

Fuel

51.9 LReference

83.3 LReference

Steering

0.9 LReference

hydrostatic powerReference

Diameter

26 cmReference

—

Width

198 cmReference

195 cmReference

RPM

1180Reference

—

Speed

932.69 meters/minReference

—

PTO & Hydraulics

Hydraulic system

68.1 LReference

41.6 LReference

Type

torque convertorReference

hydrostaticReference

Capacity

68.1 LReference

41.6 LReference

Pump flow

79.5 lpmReference

—

Steering cap.

0.9 LReference

—

Rear PTO

independentReference

optionalReference

Rear PTO Type

540 (1.375)Reference

—

Engine RPM

541@1970Reference

—

Pressure

—

151.7 barReference

Total flow

—

90.8 lpmReference

Rear Type

—

optionalReference

Dimensions

Wheelbase

191 cmReference

196 cmReference

Weight

2918 to 7740 poundsReference

1778 kgReference

Front tire

7.50-16Reference

7.50x16Reference

Rear tire

13-24Reference

14.9x24Reference

Industrial front

7.50-16Reference

11Lx16Reference

Industrial rear

13-24Reference

17.5Lx24Reference

Length

629 cmReference

660 cmReference

Ground clearance

27 cmReference

35 cmReference

Front tread

120 cmReference

137 to 144 cmReference

Rear tread

162 cmReference

152 to 193 cmReference

Height (steering wheel)

—

177 cmReference

Height (exhaust)

—

233 cmReference

Shipping

—

4989 kgReference

J.I. Case 420B attachments

Electrical

Ground

positiveReference

—

Charging system

generatorReference

—

Battery volts

12Reference

—

Battery AH

50Reference

—

Attachment overview

J.I. Case Backhoe

Backhoe type

J.I. Case BackhoeReference

J.I. Case 18.5 Extendahoe BackhoeReference

Transport height

353 cmReference

—

Digging depth

381 cmReference

426 cmReference

Reach from pivot

492 cmReference

534 cmReference

Loading height

322 cmReference

330 cmReference

Swing Arc

180°Reference

—

Speeds

J.I. Case 580B attachments

580B Serial Numbers

1971

—

8674001Reference

1972

—

8691901Reference

1973

—

8712001Reference

1974

—

8736601Reference

1975

—

8770001Reference

1976

—

8797501Reference

J.I. Case 14.5 Backhoe

Bucket force

—

4263 kgReference

Dipperstick force

—

2747 kgReference

J.I. Case 18.5 Extendahoe Backhoe

Digging depth (retracted stick)

—

426 cmReference

Digging depth (extended stick)

—

548 cmReference

Reach from pivot (retracted stick)

—

542 cmReference

Reach from pivot (extended stick)

—

765 cmReference

Loading height (retracted stick)

—

388 cmReference

Loading height (extended stick)

—

450 cmReference

Bucket force (retracted stick)

—

4263 kgReference

Bucket force (extended stick)

—

4263 kgReference

Dipperstick force (retracted stick)

—

2652 kgReference

Dipperstick force (extended stick)

—

1963 kgReference

Fit score weighs budget, operation size, crop match and data confidence against the details above. It’s guidance, not advice — always confirm with a dealer demo.